<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<title>2_受控组件</title>
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>

</head>

<body>
	<!-- 准备好一个“容器” -->
	<div id="test"></div>


	<script type="text/babel">
		//创建组件
		class Login extends React.Component {

			// 初始化状态
			state = {
				username: '',
				password: ''
			}

			// 保存用户名到状态中
			saveUsername = (event) => {
				this.setState({ username: event.target.value })
			}
			// 保存密码到状态中
			savePassword = (event) => {
				this.setState({ password: event.target.value })
			}

			// 表单提交的回调
			handleSubmit = (event) => {
				event.preventDefault();//组件表单的默认提交
				const { username, password } = this.state
				alert(`您输入的用户名为${username},密码为${password}`)
			}

			render() {
				return (
					<form onSubmit={this.handleSubmit}>
						用户名: <input onChange={this.saveUsername} name="username" type="text" />
						密码: <input onChange={this.savePassword} name="password" type="password" />
						<button>登录</button>
					</form>
				)
			}
		}
		//渲染组件
		ReactDOM.render(<Login />, document.getElementById('test'))
	</script>
</body>

</html>